<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>交集选择器</title>
    <style>
        p.font{
            color: red;
        }
        .font{
            font-size: 90px;
        }
    </style>
</head>
<body>
    <p>1</p>
    <p class="font">2</p>
    <p>3</p>
    <p class="font">4</p>
    <p>5</p>
</body>
</html>